package controllers

import (
	"encoding/json"
	"fmt"
	"io"
	"strconv"
	"strings"
	"time"

	"server/models"
	"server/pkg/jwtutil"

	beego "github.com/beego/beego/v2/server/web"
)

// BackendMcpToolController MCP工具控制器
type BackendMcpToolController struct {
	beego.Controller
}

func (c *BackendMcpToolController) mcpClaims() (*jwtutil.Claims, error) {
	auth := c.Ctx.Request.Header.Get("Authorization")
	if auth == "" {
		return nil, fmt.Errorf("未登录")
	}
	parts := strings.SplitN(auth, " ", 2)
	if len(parts) != 2 || parts[0] != "Bearer" {
		return nil, fmt.Errorf("认证信息格式错误")
	}
	claims, err := jwtutil.ParseToken(parts[1])
	if err != nil {
		return nil, fmt.Errorf("无效的token")
	}
	if claims.UserType != "backend" {
		return nil, fmt.Errorf("无权访问")
	}
	return claims, nil
}

func (c *BackendMcpToolController) mcpJsonErr(httpStatus, bizCode int, msg string) {
	c.Ctx.Output.SetStatus(httpStatus)
	c.Data["json"] = map[string]interface{}{"code": bizCode, "msg": msg}
	_ = c.ServeJSON()
}

func (c *BackendMcpToolController) mcpOk(data interface{}) {
	c.Data["json"] = map[string]interface{}{"code": 200, "msg": "success", "data": data}
	_ = c.ServeJSON()
}

type mcpToolPayload struct {
	Name    string `json:"name"`
	Type    string `json:"type"`
	URL     string `json:"url"`
	Method  string `json:"method"`
	Headers string `json:"headers"`
	Params  string `json:"params"`
	Body    string `json:"body"`
	Enabled int8   `json:"enabled"`
	Remark  string `json:"remark"`
}

// List GET /backend/mcp/tool/list
func (c *BackendMcpToolController) List() {
	claims, err := c.mcpClaims()
	if err != nil {
		c.mcpJsonErr(401, 401, err.Error())
		return
	}

	var list []models.BackendMcpTool
	_, err = models.Orm.QueryTable(new(models.BackendMcpTool)).
		Filter("tenant_id", fmt.Sprintf("%d", claims.TenantId)).
		Filter("user_id", uint64(claims.UserID)).
		Filter("delete_time__isnull", true).
		OrderBy("-id").
		All(&list)
	if err != nil {
		c.mcpJsonErr(500, 500, "查询失败: "+err.Error())
		return
	}

	c.mcpOk(map[string]interface{}{"list": list})
}

// Create POST /backend/mcp/tool
func (c *BackendMcpToolController) Create() {
	claims, err := c.mcpClaims()
	if err != nil {
		c.mcpJsonErr(401, 401, err.Error())
		return
	}

	body, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.mcpJsonErr(400, 400, "读取请求体失败")
		return
	}
	var p mcpToolPayload
	if err := json.Unmarshal(body, &p); err != nil {
		c.mcpJsonErr(400, 400, "参数格式错误")
		return
	}

	if strings.TrimSpace(p.Name) == "" {
		c.mcpJsonErr(400, 400, "工具名称不能为空")
		return
	}
	if strings.TrimSpace(p.URL) == "" {
		c.mcpJsonErr(400, 400, "API地址不能为空")
		return
	}

	tool := models.BackendMcpTool{
		TenantID:   fmt.Sprintf("%d", claims.TenantId),
		UserID:     uint64(claims.UserID),
		Name:       strings.TrimSpace(p.Name),
		Type:       strings.TrimSpace(p.Type),
		URL:        strings.TrimSpace(p.URL),
		Method:     strings.TrimSpace(p.Method),
		Headers:    strings.TrimSpace(p.Headers),
		Params:     strings.TrimSpace(p.Params),
		Body:       strings.TrimSpace(p.Body),
		Enabled:    p.Enabled,
		Remark:     strings.TrimSpace(p.Remark),
		CreateTime: time.Now(),
		UpdateTime: time.Now(),
	}

	id, err := models.Orm.Insert(&tool)
	if err != nil {
		c.mcpJsonErr(500, 500, "创建失败: "+err.Error())
		return
	}

	c.mcpOk(map[string]interface{}{"id": id})
}

// Update PUT /backend/mcp/tool/:id
func (c *BackendMcpToolController) Update() {
	claims, err := c.mcpClaims()
	if err != nil {
		c.mcpJsonErr(401, 401, err.Error())
		return
	}

	idStr := c.Ctx.Input.Param(":id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.mcpJsonErr(400, 400, "ID格式错误")
		return
	}

	tool := models.BackendMcpTool{ID: id}
	if err := models.Orm.Read(&tool); err != nil {
		c.mcpJsonErr(404, 404, "工具不存在")
		return
	}
	if tool.TenantID != fmt.Sprintf("%d", claims.TenantId) {
		c.mcpJsonErr(403, 403, "无权操作")
		return
	}

	body, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.mcpJsonErr(400, 400, "读取请求体失败")
		return
	}
	var p mcpToolPayload
	if err := json.Unmarshal(body, &p); err != nil {
		c.mcpJsonErr(400, 400, "参数格式错误")
		return
	}

	tool.Name = strings.TrimSpace(p.Name)
	tool.Type = strings.TrimSpace(p.Type)
	tool.URL = strings.TrimSpace(p.URL)
	tool.Method = strings.TrimSpace(p.Method)
	tool.Headers = strings.TrimSpace(p.Headers)
	tool.Params = strings.TrimSpace(p.Params)
	tool.Body = strings.TrimSpace(p.Body)
	tool.Enabled = p.Enabled
	tool.Remark = strings.TrimSpace(p.Remark)
	tool.UpdateTime = time.Now()

	_, err = models.Orm.Update(&tool)
	if err != nil {
		c.mcpJsonErr(500, 500, "更新失败: "+err.Error())
		return
	}

	c.mcpOk(nil)
}

// Delete DELETE /backend/mcp/tool/:id
func (c *BackendMcpToolController) Delete() {
	claims, err := c.mcpClaims()
	if err != nil {
		c.mcpJsonErr(401, 401, err.Error())
		return
	}

	idStr := c.Ctx.Input.Param(":id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.mcpJsonErr(400, 400, "ID格式错误")
		return
	}

	tool := models.BackendMcpTool{ID: id}
	if err := models.Orm.Read(&tool); err != nil {
		c.mcpJsonErr(404, 404, "工具不存在")
		return
	}
	if tool.TenantID != fmt.Sprintf("%d", claims.TenantId) {
		c.mcpJsonErr(403, 403, "无权操作")
		return
	}

	now := time.Now()
	tool.DeleteTime = &now
	_, err = models.Orm.Update(&tool, "delete_time")
	if err != nil {
		c.mcpJsonErr(500, 500, "删除失败: "+err.Error())
		return
	}

	c.mcpOk(nil)
}

// Test POST /backend/mcp/tool/test
func (c *BackendMcpToolController) Test() {
	// 验证用户登录状态
	if _, err := c.mcpClaims(); err != nil {
		c.mcpJsonErr(401, 401, err.Error())
		return
	}

	body, err := io.ReadAll(c.Ctx.Request.Body)
	if err != nil {
		c.mcpJsonErr(400, 400, "读取请求体失败")
		return
	}

	var p mcpToolPayload
	if err := json.Unmarshal(body, &p); err != nil {
		c.mcpJsonErr(400, 400, "参数格式错误")
		return
	}

	if strings.TrimSpace(p.URL) == "" {
		c.mcpJsonErr(400, 400, "API地址不能为空")
		return
	}

	// TODO: 实现MCP工具测试逻辑
	// 这里只是一个示例实现，实际测试逻辑需要根据工具类型和配置来实现
	c.mcpOk(map[string]interface{}{
		"success": true,
		"message": "测试连接成功",
		"method":  p.Method,
		"url":     p.URL,
	})
}